I've been using all lemmy apps and I'd say maybe thunder is a contender for fluidity. Summit for post view ( judging only based on compact view bc that's the only view I use). Liftoff cos I can stay signed in multiple accounts, "everything tab" and search function. I see infinity as a sort of foss Sync with a less compact view but more info about user/community instance.

Also let's not forget good ol' jerboa. Beside the login problem it had (now sorted out) it pretty much does everything.

I'm also excited about slide development. It's going kinda slow but it's on github